n one of the jointed appendages of an animal used for locomotion or grasping: arm; leg; wing; flipper
n any of the main branches arising from the trunk or a bough of a tree
n (astronomy) the circumferential edge of the apparent disc of the sun or the moon or a planet
n either of the two halves of a bow from handle to tip
n the graduated arc that is attached to an instrument for measuring angles
n any projection that is thought to resemble a human arm